There is no reason to have 3.48wpg. I have 2.88wpg, and can only run that for 5 hours. I cut that in half to increase viewing time another 3 hours. And even now, the GDA is coming back so I'll have to cut it back even further. If you had 3.48wpg, you'd gain nothing except more algae issues. My plants pearl like crazy with 2.88wpg. Look at my 75g pictures I have in my sig line, and then look at the same thread for the pictures before those. Note the number of days in between. Growth rate is outstanding at 2.88wpg. My P. stellatus (which requires very bright light) was growing at the rate of 1" every day!
That pretty much answers your other questions regarding mixing fixtures (no reason you can't) or what other fixture to buy. 65W on a 29g tank is plenty of light all by itself. I'd only change it if you don't like the heat coming from a PC fixture (I am biased towards T5 fixtures). If you just had to have more light, then get a single Aqualight T5. I think it's 18w. That would put you at a total of 83W which brings you to 2.86wpg. But, honestly, I don't see the need.
Start out with just the 65w fixture all by itself. If you find that your plants do not thrive, then and only then should you get more light. I think you'll find no need for it.
As far as regulators, everyone will have their favorites. I'm using the Milwaukee MA957 without any problems. I can't say it's the cheapest, but it does seem to be on the less expensive side of the ones I have seen.
As far as a reactor, you can build an excellent DIY "Rex Style" reactor for very little money. Here's a link: http://www.rexgrigg.com/diy-reactor.htm
This is what I have so I know it works.
Your wife's comments sounds like something I would say! All my tanks must have cabinets that match the room's furniture (or at least doesn't clash), can't show nicks, scratches or water marks very easily, and absolutely must have a canopy to polish the overall look. If i didn't have to open and close the canopy lid so often, I'd have pictures, statues and flowers on top!
Your dog sounds like my cat. Yet another reason for having a canopy.
Funny note: When I moved my tanks into my house (I had a house and apartment, but have left the apartment and brought all my tanks to the house), my husband saw my 20L tank in the living room, and stopped to ask, "Is that a new aquarium?" To which I could honestly answer no. He scratched his head and then muttered to himself that he must have not paid enough attention to it at the apartment (he has ADD so this happens) and walked off.
The aquarium is not new. But the stand and canopy are!
I was perfectly honest in my answer. He just didn't ask the right question.